Reaction of metals with water Reaction of metals with water produces metal oxide and hydrogen gas. The metal oxides dissolves in excess of water forming metal hydroxides. Since heat is released during reaction therefore the reaction is exothermic. Metal + Water → Metal oxide + Hydrogen Metal oxide + Water → Metal hydroxide + Heat […]
Chemistry
Reaction of Metals with Oxygen
The physical properties are insufficient to identify if a substance is metal or a nonmetal and so there is need to test chemical properties of metal and non-metal . Lets start with reaction of metals with oxygen. Metal react with oxygen to form metal Oxide Metal + Oxygen → Metal Oxide 4K + O2 → […]
Heating Effect of Electric Current
While dealing with electricity a very important phenomena is heating effect of electric current . Whenever there is current flow there is motion of electrons. During their journey electrons collide with other electrons, atoms or ions present in the conductor. At each collision, a part of the kinetic energy i.e. energy of a moving electron […]
Rutherford’s Model of Atom
Thomson’s model revealed that atom has spherical structure, with positive charge spread all over the sphere and electrons are embedded in it. Also there is equal number of positive and negative charge i.e. atom is electrically neutral. Ernest Rutherford carried out experiments by taking consideration in Thomson’s model and presented more accurate model i.e. Rutherford’s […]
Bohr’s Model of Atom
Rutherford’s model explained that atoms revolve around nucleus in circular path. While revolving, electrons possess kinetic energy . Due to motion, energy from electron is continuously radiated. This suggest that electron must be losing energy continuously while revolving around nucleus. This may lead to fall of electron into the nucleus which will make atom highly […]
Physical Properties of Metals and Non-Metals
During classification of elements scientist considered few properties that differentiate between metals and nonmetals. Here are the physical properties of metals and non metals – Lustre If you rub the surface of metals like iron, copper, aluminium and magnesium by sand paper, then there is change in appearance. Basically, in pure state all metals have […]
States of Matter
States of matter exist in three states, solid state, liquid state and gaseous state. Solid state of matter Solids have definite shape, size and fixed volume. Particles of solids are held with strong force of attraction, hence, there are less vacant spaces between the particles. This makes solids very less compressible. Moreover, solids are rigid […]
Matter and its properties
Matter is anything which has mass and occupies space. A chair has a specific mass and it also occupies space, therefore, a chair is a matter. Some other examples are glass, chalk stick, bicycle, etc. Matter is made up of extremely small particles which are invisible to naked eye. Classification: Ancient Indian Philosophers believed that […]
Periodic Table and Periodic Trends
During the discovery of elements, atomic mass was treated as the most fundamental property. In 1913 Henry Moseley showed that atomic number is the most fundamental property. Based on which he proposed the Modern Periodic Law “Properties of elements are a periodic function of their atomic number.” The classification of elements considering atomic number as […]